why should the taliban take risks when they know we're leaving. it's more for the afghan national army of course now who want to show their loyalty to taliban. >> the defense secretary leon panetta says the taliban is trying to undermine our trust and joint chiefs of staff says that won't work. >> and one army commander told me insider attacks are an affront to their honor, at odds with their culture. as for us, we are adapting to changes in that threat as well. that's what professional militaries do. >> reporter: the number of deaths from insiders attacks has risen dramatic from 20, two years ago to 35 last year and 53 this year so far, even as both sides are working hard to stop them with beefing up security on joint missions and ante up background checks on recruits. >> harris: thank you. we've heard them speak about each other and now they'll speak to each other and the nation of course. what's at steak at the debate? we're ask bret baier who arrived at the debate site in colorado. the former marines started out, and a few days later. 3200 mil